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Acquisitions - Aggregate Consideration Paid or Payable and Allocation of Net Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended
Jul. 25, 2025
Sep. 30, 2025
Dec. 31, 2024
Business Combination [Line Items]      
Contingent consideration   $ 493,986 $ 344,984
Goodwill   6,701,458 $ 5,316,443
Dynamic Systems, LLC      
Business Combination [Line Items]      
Cash $ 1,260,000 1,259,262  
Value of Quanta common stock issued   218,756  
Contingent consideration $ 190,600 190,561  
Fair value of total consideration transferred or estimated to be transferred   1,668,579  
Cash and cash equivalents   66,696  
Accounts receivable   285,268  
Contract assets   9,219  
Prepaid expenses and other current assets   2,895  
Property and equipment   34,770  
Other assets   23,048  
Identifiable intangible assets   532,400  
Accounts payable and accrued expenses   (101,984)  
Contract liabilities   (147,913)  
Other non-current liabilities   (15,770)  
Deferred income taxes   0  
Total identifiable net assets   688,629  
Goodwill   979,950  
Fair value of net assets acquired   1,668,579  
Business Acquisitions      
Business Combination [Line Items]      
Cash   605,642  
Value of Quanta common stock issued   161,554  
Contingent consideration   98,856  
Fair value of total consideration transferred or estimated to be transferred   866,052  
Cash and cash equivalents   32,874  
Accounts receivable   138,601  
Contract assets   8,322  
Prepaid expenses and other current assets   7,954  
Property and equipment   96,317  
Other assets   7,282  
Identifiable intangible assets   285,969  
Accounts payable and accrued expenses   (65,507)  
Contract liabilities   (27,034)  
Other non-current liabilities   (3,942)  
Deferred income taxes   (1,162)  
Total identifiable net assets   479,674  
Goodwill   386,378  
Fair value of net assets acquired   $ 866,052